MICHIGAN (Cont. ) 



16. Fertilization of a Marl Lake and a Trout Stream of Low Productivity 



The above two projects have a common goal and are being carried out to- 

 gether. Fertilizer applied to the marl lake becomes, in part, organic nu- 

 trients. The incorporation of these nutrients into the biota of the streann is 

 being studied. 



Otsego County; began 1954, to close 1957; R. C. Ball and F. F. Hooper, 

 Leaders. 



Address inquiries to: R. C. Ball, as in No. 15 above. 



17. Effects of Fish Predation on Production of Fish-food Organisms 



An investigation of the relationships between standing crops of fish and total 

 fish populations. Approach is through a study of the dynamics of the food- 

 organism complex and the influence of predation by the fish population. 



Lake City Experiment Station Ponds; began May 1956, continuing; Robert C. 

 Ball and D. W. Hayne, Leaders. 



Address inquiries to: R. C. Ball, as in No. 15 above. 



18. Primary Production in a Warm-water Stream 



A study of the rate of synthesis of organic matter in a warm-water stream, 

 including production rates under high nutrient conditions, as well as those of 

 low nutrient analysis. 



Ingham County; began 1955, to close 1958; Robert C. Ball, Leader. 



Address inquiries to: R. C. Ball, as in No. 15, above. 



19. Biological Effects of a Concentration of Waterfowl on a Warm-water Lake 



A quantitative chemical evaluation of certain nutrients contributed seasonally 

 to the lake and their biological effects within the lake. 



Wintergreen Lake, Kellogg Bird Sanctuary, Hickory Corners, Michigan; 

 began 1955, continuing; R. D. VanDeusen, Leader. 



Address inquiries to: R. C. Ball as in No. 15 above. 



20. Fishery Management Evaluation 



The objectives are: (1) To evaluate various stocking procedures in terms 

 of returns to the angler, and (2) to evaluate angler ability to catch fish and the 

 degree and nature of the variation in angling success. 



East Lansing and Augusta; began July 1932, continuing; $250; Peter S. Tach, 

 Leader; reports available. 



Address inquiries to: P. S. Tach, Department of Fisheries and Wildlife, 

 University of Michigan, East Lansing, Michigan. 



21. Ecology of Commercial Fish Species in Northern Lake Michigan 



The primary purpose of this project is to determine and evaluate the 

 factors involved in the success or failure of successive year-classes of some 

 important commercial fish species. Most of the work to date has been a study 

 of the growth and age-composition of the whitefish. Long-range plans include 

 studies of other species, with more emphasis on young-of-the-year fish. 



Big Bay de Noc and northern Lake Michigan; began July 1955; $3000; 

 Eugene W. Roelofs, Leader. 



Address inquiries to: E. W. Roelofs, Department of Fisheries and Wild- 

 life, University of Michigan, East Lansing, Michigan. 



Central Michigan College 



1. Ecology and Taxonomy of Midge Larvae 



Field collections of midge larvae, rearing of same in laboratory for 



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